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Goals for Chapter 18

Goals for Chapter 18. To calculate electrical potential energy. To define potential. To study equipotential surfaces To review Millikan’s oil drop experiment. To examine capacitors. To determine electrical field energy. Electrical and gravitational forces - Figures 18.1-18.2.

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Goals for Chapter 18

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  1. Goals for Chapter 18 • To calculate electrical potential energy. • To define potential. • To study equipotential surfaces • To review Millikan’s oil drop experiment. • To examine capacitors. • To determine electrical field energy

  2. Electrical and gravitational forces - Figures 18.1-18.2 • The forces are similar and conservative.

  3. Work and energy changes - Figures 18.3 • Work is done on the charge by the field.

  4. Parallel plates and energy conservation – Example 18.2 • See the worked example on page 588 and Figure 18.8.

  5. Potential of point and plate charges – Examples 18.3,4 • Refer to figures 18.9 and 18.10 with worked examples on pages 589-91.

  6. The equipotential map around charges – Figure 18.11 • Around an charge or arrangement of charges regions of equal potential may be drawn as equal-potential lines.

  7. Equipotential lines may not cross – Figure 18.12 • Considering conduction and geometry one may prove why the lines do not cross. • Refer to page 592 in your text.

  8. Robert Millikan and electronic charge – Figure 18.16 He suspended charged oil drops of various masses between the parallel plates of a capacitor. His determination found many different multiple of *the same number*. The number was the charge of a single electron, 1.60217653(14)x10-19C.

  9. Energetics of a single electron – Figure 18.17 One electron suspended in a 1V field allows the definition of an energy equivalence. 1eV = 1.602x10-19J

  10. The capacitor – Figure 18.18 Devices may be constructed which separate two conductors of various sizes with materials of various conductance.

  11. The symbol and units of capacitance – Figure 18.19 • Refer to pages 596 – 598 in your text. • Define the Farad and follow worked examples 18.6 and 18.7.

  12. Capacitors are often joined – Figures 18.21 • Like resistors, capacitors may be combined sequentially (in series).

  13. Capacitors are often joined II – Figures 18.22 • Like resistors, capacitors may be combined in simultaneous fashion (in parallel).

  14. Capacitors store energy – Example 18.9 • This is the whine you can hear while an electronic flash charges. • Refer to the worked example on pages 602-603.

  15. What is between the conductors? – Figures 18.26,27 • As we stated on an earlier slide, the amount of charge that may be stored in a capacitor depends in part on the “filler”.

  16. Capacitors with different dialectrics – Figure 18.28 • Select the dialelectric from table 18.1.

  17. Calculation with a specific dialectric – Example 18.10 Refer to the worked problem on page 605 and figure 18.29.

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